基于扩张观测器的三维动态面导引律

为提高导弹拦截高速机动目标的精度,基于自抗扰控制理论的估计补偿思想,设计了考虑自动驾驶仪动态特性和目标机动的三维动态面导引律。首先,建立了考虑自动驾驶仪动态特性的三维耦合制导模型;其次,针对制导模型中所存在的目标机动和测量噪声的干扰,设计扩张观测器估计目标机动和视线角速率,并将其应用到导引律的设计中;再次,基于动态面控制方法设计了三维空间导引律,避免了传统反演控制方法中的“微分膨胀”问题;最后,在目标作不同机动情况下,所设计的导引律与比例导引律、动态面导引律进行比较,仿真结果表明所设计的导引律具有更好的制导性能。

Three-dimensional dynamic surface guidance law based on extended state observer

A novel three dimensional dynamic surface guidance law for intercepting high-speed maneuvering targets is presented accounting for the dynamics of missile’s autopilot and target’s maneuver, which is based on the active disturbance rejection control (ADRC) to estimate and compensate the uncertainties. The three dimensional guidance model considering the dynamics of autopilot is firstly established. To take account of the influence of target’s maneuver and measurement noise, the target’s maneuver and line of sight angular rate are estimated by the extended state observer for further implementation. To avoid the “explosion of terms” caused by traditional back-stepping control, the dynamic surface control method is introduced to design the three-dimensional guidance. Finally, simulation results show the superiority of the proposed guidance law in comparison with the proportional navigation guidance law and dynamic surface guidance under different target’s maneuver circumstances.